Motorola Axiom CMD11E1 Betriebsanweisung PDF herunterladen (Seite 47)

3.10. HARDWARE INTERFACING 47

3.3K

LED

To ground

To test point

PA5 for example

Figure 3.1: Test Probe. Make sure that the resistor is connected to the anode of

the light emitting diode. The longer lead of the light emitting diode is the anode.

To test a pin, connect the cathode to ground and the resistor to the pin.

5V (pin 9 or 10)

4.7K

22K

PA0 (pin 1)

Ground (pin 11 or 12)

Switch

Figure 3.2: Typical input connection

6. Connect a (RIGHT) test probe between pin 6 and pin 12. The cathode of

the light emitting diode should be connected to pin 12 and the free end of

the resistor to pin 6.

7. Label the two light emitting diodes as LEFT and RIGHT so that it is easy

to identify them (you can use a magic tape and small pieces of paper).

8. Connect the input circuit as shown in ﬁgure 3.2.

9. Check and recheck all your connections before you connect the power to the

HC11.

Special instructions for FOX11 users

1. Connect two LED circuits shown in ﬁgure 3.1 to PA4 and PA5. Label the

circuit connected to PA4 LEFT and the one connected to PA5 as RIGHT.

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Motorola Axiom CMD11E1 Betriebsanweisung Seite 47